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Heart Machine
Heart Machine is an American independent video game studio founded by Alx Preston in Los Angeles in 2013, known for Hyper Light Drifter (2016) and Solar Ash (2021).
Heart on My Sleeve (song)
"Heart on My Sleeve" is a 2023 song with AI-generated vocals imitating Drake and The Weeknd, made by the anonymous producer Ghostwriter and removed from streaming platforms.
Heart's Content Cable Station
The Heart's Content Cable Station in Newfoundland is the former western terminus of the first permanent transatlantic telegraph cable, landed in 1866 and relaying messages until 1965, now a museum.
Heartbleed
Heartbleed, disclosed in April 2014, was a serious security flaw in the OpenSSL cryptographic library that let attackers read server memory, potentially exposing passwords and private encryption keys.
Hearth
A hearth is the fireproof floor of a fireplace, usually of stone, brick, or tile, and by extension a symbol of home and family life.
Heartland Hydrogen Hub
The Heartland Hydrogen Hub is one of seven United States Department of Energy regional hydrogen hubs, led by the University of North Dakota and focused on fertilizer.
HeartLander
HeartLander is a miniature tethered mobile robot developed at Carnegie Mellon University that crawls on the beating heart's surface to deliver injections, lead placement, and ablation.
HeartMate 3
The HeartMate 3 is an Abbott left ventricular assist device whose fully magnetically levitated rotor reduces clotting, approved in 2017 and proven in the MOMENTUM 3 trial.
Heat coloring of metals
Heat coloring of metals, also called heat tinting or temper coloring, is the formation of interference colors on heated metal from a thin oxide film.
Heat engine
A heat engine, or thermal engine, is a device that converts heat from a hot source into mechanical work, rejecting the rest to a cold sink.
Heat exchanger
A heat exchanger is a device that transfers heat from one fluid to another through a separating wall without mixing them, found in steam systems, refineries, refrigeration, and HVAC.
Heat exchanger network retrofit
Heat exchanger network retrofit modifies the heat exchanger network of an existing process plant to improve heat recovery, cutting energy demand and cost by adding area, enhancing heat transfer, or changing structure.
Heat integration
Heat integration is a chemical engineering design method that matches a plant's heat sources and sinks through pinch analysis, cutting external utility use, often by 20% or more.
Heat of combustion
The heat of combustion, also called the heating value or calorific value, is the energy released when a unit amount of a substance burns completely in oxygen.
Heat pipe
A heat pipe is a sealed, passive device that transfers large amounts of heat through evaporation and condensation of a working fluid, with no moving parts.
Heat pipe heat exchanger
A heat pipe heat exchanger (HPHX) is a passive heat exchanger that transfers heat between two airstreams via sealed heat pipes, with zero cross-contamination and no external power.
Heat pump
A heat pump is a device that moves heat from a cooler place to a warmer place using electricity, providing heating, cooling, and water heating.
Heat pump dryer
A heat pump dryer is a ventless clothes dryer that dries laundry in a closed air loop using a heat pump, saving at least 28% of the energy.
Heat pump water heater
A heat pump water heater is an electric appliance that moves heat from surrounding air into a water tank, delivering two to four times the heat per unit of electricity.
Heat recovery steam generator
A heat recovery steam generator (HRSG) is a boiler that recovers heat from hot gas turbine exhaust to raise steam, most often for a steam turbine.
Heat recovery ventilation
Heat recovery ventilation, also called an air exchanger, is a balanced ventilation method that transfers heat from exhaust air to incoming fresh air, recovering up to 80% of it.
Heat sink
A heat sink is a passive heat exchanger that spreads heat from a component such as a semiconductor die over a large finned surface cooled by moving air.
Heat treating
Heat treating, also called heat treatment, is a manufacturing process of controlled heating and cooling of metals, most significant for steel, whose cooling rate determines whether martensite, bainite, or pearlite forms.
Heat-affected zone
The heat-affected zone (HAZ) is the region of base metal altered by welding or cutting heat without melting, often the weakest part of a joint.
Heat-assisted magnetic recording
Heat-assisted magnetic recording (HAMR) is a hard disk drive technology that briefly heats the disk surface with a laser so data can be written on very stable magnetic materials.
Heat-staked insert
A heat-staked insert, also called a heat-set or thermal insert, is a knurled brass bushing pressed into softened plastic, giving plastic parts durable, reusable machine-screw threads.
Heath Robinson (codebreaking machine)
Heath Robinson was an electro-mechanical codebreaking machine used at Bletchley Park from June 1943 to find the wheel start positions of the German Lorenz cipher.
Heathrow Airport
Heathrow Airport, also known as London Heathrow, is London's main international airport about 23 km west of central London, opened in 1946 and Europe's busiest, with 84.5 million passengers in 2025.
Heathrow Airport Holdings
Heathrow Airport Holdings, formerly BAA, is the British company that owns and operates London Heathrow Airport, renamed in October 2012 after selling Gatwick, Edinburgh, and Stansted.
Heathrow Express
Heathrow Express is a private rail service between London Paddington and Heathrow Airport, launched in 1998 and known for its non-stop 15-minute journey, running four trains an hour.